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Home >> GMC >> 2010 >> Terrain SLT, 2.4 W, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 2.2L Or 2.4L - DTC P1255 To DTC P2635 >> DTC P2615 or P2616 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the K108 active noise cancellation module.
  2. Ignition ON, radio ON, test for 5-7 V between the signal circuit terminal 5 and ground.
    • If less than specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  3. If all circuits test normal, replace the K108 active noise cancellation module.
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